s="0123456789"
s[-1..-2]    #=> ""
s[-2..-1]    #=> "89"
s[-1..-3]    #=> nil
s[-3..-1]    #=> "789"
s[-1..-2] = "..." ; s #=> "012345678...9"

Expect s[-1..-2] returns nil as s[-1..-3]. (bug ? it returns empty string 
instead of nil.)

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